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. 2019 Sep 23;14(9):e0222662. doi: 10.1371/journal.pone.0222662

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© 2019 Chen et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 2 — Flexural strength (FS) and flexural modulus (FM) of TPNR/GNP composites (a) treated with different ultrasonic (US) hours, (b) at various filler weight fractions, (c) ANOVA analysis for both factors in flexural properties, (d) FS enhancement and (e) YM enhancement of investigated composites compared with pure TPNR. Note: ^aF ratio = mean between groups variance/ mean within group variance; ^bProbability from 0 to 1; ^ccritical F-value based on F distribution. Groups with a significant difference (p < 0.05) compared to (i) TPNR/GNP composite without US assistance (0 hour) and assisted with 3 hours US are indicated by * and # respectively; (ii) TPNR composites without GNP and incorporated with 0.5 wt.% GNP are indicated by @ and ♦ symbols, respectively.